package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){
    }

    /**
     * 前置通知
     */
    @Before("com.sky.aspect.AutoFillAspect.autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段自动填充");

        //获取当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature)  joinPoint.getSignature(); //方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class); //获取注解对象
        OperationType operationType = autoFill.value();
        //获取参数--实体对象
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0){
            return;
        }

        Object entity = args[0];

        //准备赋值数据

        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据当前操作类型，反射赋值
        if(operationType == OperationType.INSERT){
            try {
                Method setCreateTime =  entity.getClass().getDeclaredMethod("setCreateTime",LocalDateTime.class);
                Method setCreateUser =  entity.getClass().getDeclaredMethod("setCreateUser",Long.class);
                Method setUpdateTime =  entity.getClass().getDeclaredMethod("setUpdateTime",LocalDateTime.class);
                Method setUpdateUser =  entity.getClass().getDeclaredMethod("setUpdateUser",Long.class);

            //通过反射赋值
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if(operationType == OperationType.UPDATE){
            try {
                Method setUpdateTime =  entity.getClass().getDeclaredMethod("setUpdateTime",LocalDateTime.class);
                Method setUpdateUser =  entity.getClass().getDeclaredMethod("setUpdateUser",Long.class);
                //通过反射赋值
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }



    }
}

